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A 'simple' sound activated LED.

Soooooo, I don't have a whole lot of knowledge about electronics. But I'd like to make/have someone make a single LED bulb that lights up when a microphone recieves sound.

I'd 'actually' like to fit a small microphone into a helmet's mouth section, and have an LED activated on the outside.

If it's possible to incorporate a speaker on the outside as well, that'd be incredible.

And even more-so, if it could change/amplify your voice on the way out, that'd be simply orgasmic.